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MAKEHISTORY(8)			    InterNetNews Documentation			   MAKEHISTORY(8)

       makehistory - Initialize or rebuild INN history database

       makehistory [-abeFIOx] [-f filename] [-l count] [-T tmpdir]

       makehistory rebuilds the history(5) text file, which contains a list of message IDs of
       articles already seen by the server.  It can also be used to rebuild the overview data-
       base.  Note that the dbz(3) indexes for the history file are rebuilt by makedbz(8), not by
       makehistory as in earlier versions of INN.

       The default name of the history text file is pathdb/history; to specify a different name,
       use the -f flag.

       By default, makehistory will scan the entire spool, using the storage manager, and write a
       history line for every article.	To also generate overview information, use the -O flag.

       WARNING: If you're trying to rebuild the overview database, be sure to delete or zero out
       the existing database before you start for the best results.  Otherwise, you may end up
       with problems like out-of-order overview entries, excessively large overview buffers, and
       the like.

       If you are using ovdb as your overview method, you will want to have the ovdb processes
       running while rebuilding overview; otherwise, the Berkeley DB transaction logs will be
       extremely large by the time makehistory finishes.  You can start them with dbprocs(8).

       -a  Append to the history file rather than generating a new one.  If you append to the
	   main history file, make sure innd(8) is throttled or not running or you can corrupt
	   the history.

       -b  Delete any messages found in the spool that do not have valid Message-ID headers in

       -e  Compute Bytes headers which is used for overview data.  This option is valid only if
	   -O flag is specified and overview.fmt includes "Bytes:".

       -f filename
	   Rather than writing directly to pathdb/history, instead write to filename.

       -F  Fork a separate process to flush overview data to disk rather than doing it directly.
	   The advantage of this is that it allows makehistory to continue to collect more data
	   from the spool while the first batch of data is being written to the overview data-
	   base.  The disadvantage is that up to twice as much temporary disk space will be used
	   for the generated overview data.  This option only makes sense in combination with -O.
	   With "buffindexed", the "overchan" program is invoked to write overview.

       -I  Don't store overview data for articles numbered lower than the lowest article number
	   in active(5).  This is useful if there are old articles on disk for whatever reason
	   that shouldn't be available to readers or put into the overview database.

       -l count
	   This option specifies how many articles to process before writing the accumulated
	   overview information out to the overview database.  The default is 10000.  Since over-
	   view write performance is faster with sorted data, each "batch" gets sorted.  Increas-
	   ing the batch size with this option may further improve write performance, at the cost
	   of longer sort times.  Also, temporary space will be needed to store the overview
	   batches.  At a rough estimate, about 300 * count bytes of temporary space will be
	   required (not counting temp files created by sort(1)).  See the description of the -T
	   option for how to specify the temporary storage location.  This option has no effect
	   with "buffindexed", because "buffindexed" does not need sorted overview and no batch-
	   ing is done.

       -O  Create the overview database as well as the history file.  Overview information is
	   only required if the server supports readers; it is not needed for a transit-only
	   server.  If you are using the "buffindexed" overview storage method, erase all of your
	   overview buffers before running makehistory with -O.

       -T tmpdir
	   If -O is given, makehistory needs a location to write temporary overview data.  By
	   default, it uses pathtmp, set in inn.conf(5), but if this option is given, the pro-
	   vided tmpdir is used instead.  This is also used for temporary files created by
	   sort(1) (which is invoked in the process of writing overview information since sorted
	   overview information writes faster).  By default, sort usually uses /var/tmp; see the
	   man page for sort on your system to be sure.

       -x  If this option is given, makehistory won't write out history file entries.  This is
	   useful mostly for building overview without generating a new history file.

       Here's a typical example of rebuilding the entire history and overview database, removing
       broken articles in the news spool.  This uses the default temporary file locations and
       should be done while innd isn't running or is throttled.

	   makehistory -b -f history.n -O -l 30000 -I

       This will rebuild the overview (if using "buffindexed", erase the existing overview buf-
       fers before running this command) and leave a new history file in history.n in pathdb.  To
       preserve all of the history entries from the old history file that correspond to rejected
       articles or expired articles, use:

	   cd /usr/local/news/db
	   awk 'NF == 2 { print }' < history >> history.n

       (replacing the path with your pathdb, if it isn't the default).	Then look over the new
       history file for problems and run:

	   makedbz -s `wc -l < history` -f history.n

       Then rename all of the files matching "history.n.*" to "history.*", replacing the current
       history database and indexes.  After that, it's safe to unthrottle innd.

       For a simpler example:

	   makehistory -b -f history.n -I -O

       will scan the spool, removing broken articles and generating history and overview entries
       for articles missing from history.

       To just rebuild overview:

	   makehistory -O -x -F

	   Read for pathdb and pathtmp.

	   This is the default output file for makehistory.

	   Where temporary files are written unless -T is given.

       Originally written by Rich $alz <rsalz@uunet.uu.net> for InterNetNews and updated by vari-
       ous other people since.

       $Id: makehistory.8,v 2002/08/25 23:58:41 rra Exp $

       dbz(3), active(5), history(5), inn.conf(5), dbprocs(8), ctlinnd(8), innd(8), makedbz(8).

INN 2.3.4				    2002-08-25				   MAKEHISTORY(8)
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